[Solved] i need an answer please : bootstrap 3 this is for a job applyment?

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i found the result my self just for fun ,here the solution:

body img {
    float: left;  
}
body img:nth-child(2n) {
   float: right;
}

#content{display:flex;text-align:center;width:100%}

.changeme1{
   margin-left:auto;float:none;
}
.changeme2{
   margin-right:auto;float:none;
}

solved i need an answer please : bootstrap 3 this is for a job applyment?